<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>留言框</title>
<style>
.bigbox{
    width: 400px;
    height: 500px;
    margin: auto;
   
}
.box1{
    width: 300px;
    height: 150px;
    margin: auto;
    margin-top: 50px;
}
.box2{
    width: 300px;
    height: 150px;
    margin: auto;
    margin-top: 50px;
}
.box3{
    width: 100px;
    height: 50px;
    margin: auto;
    margin-top: 40px;
    border: 1px,black,solid;
}
body
			{
				background-attachment: fixed;		
				background-position: center;		
				background-image: url("R-C.jpg");
				background-repeat: no-repeat;	
				background-size: cover;	
			}
</style>
</head>
<body></body>
    <div class="bigbox">
        <div class="box1">
            <textarea name="" id="xs" style="height: 150px; width: 300px;"></textarea>
        </div>
        <div class="box2">
            <textarea name="" id="sr" style="height: 150px; width: 300px;"></textarea>
        </div>
        <div class="box3">
            <button id="tj" style="height: 50px; width: 100px;">提交</button>
        </div>
    </div>